SU648883A1 - Liquid viscosity sensor - Google Patents

Description

A flywheel, a rotation angle meter and a sensor element immersed in the source liquid are put on the output axis, a program time relay, the first output of which is connected to the electrically or the electromagnetic clutch inputs, and the second upflow - to the rotation angle marker input. The measurement is carried out in a transient mode when the sensitive element is disconnected from the electric motor 13. However, even this type of sensor does not provide sufficient accuracy.

The aim of the invention is to improve the measurement accuracy.

This is achieved by introducing a one-shot in the proposed sensor, the input of which is connected to the output of the angle of rotation angle, to the first input of the group of output amplifiers and to the first output of the sensor. The first output of the one-shot is connected to the second input of the direct following key, the second output is connected to the second input of the following key with a delay, the first output of which is connected to the first input of the direct following key and to the output of the account circuit key. The first input of the latter is connected to the output of the crystal oscillator, and the second - to the third output of the software time relay. The second input of the time pulse counter is connected to the output of the direct following key with a delay, and the first input is connected to the second output of the software time relay, and the counter inputs are connected to the second inputs of the output amplifier group, the output of which is connected to the sensor outputs.

Pa figs. 1 shows the flow chart of the proposed sensor; in fig. 2 - time diagram of the work of some of its elements.

A viscosity meter sensor contains a software time relay I, which determines the rhythm of information output by the sensor, an electric motor 2 accelerating the rotating parts of the sensor before measuring to the required speed, an electromagnetic coupling 3 connecting the electric motor with rotating parts of the sensor for an acceleration time, angle 4 rotation, issuing a voltage pulse at each rotation of its rotor at a given angle, the flywheel 5, storing the required energy in the acceleration process. The sensor also contains a sensing element 6, which perceives the inhibitory effect of the liquid under investigation, depending on its viscosity, a crystal oscillator 7, which penetrates rectangular voltage pulses through constant time intervals, a key 8 of the counting circuit, which transmits pulses of the crystal oscillator 7 upon receipt of the resolving potential from software time relay 1, one-shot 9, controlling the keys of the direct following 10 and following with a delay P. Key 10 direct

the following transmits pulses of the crystal oscillator 7 at a time when the pulses of the rotation angle counter 4 are absent, the following key 1 with a delay transmits the pulses of the quartz crystal

generator 7, arising simultaneously with the pulses of the rotation angle marker 4. Line delay 12 delays the pulses of the quartz oscillator 7 for the duration of the passage in the pulse sensor of the angle marker 4. The counter 13 pulses of time, in the process of measuring, adds up the pulses of a quartz oscillator 7. A group of output amplifiers 14 outputs a parallel binary pulse code at the output of the sensor over a pulse of the marker pulse 4.

the time of the next triggering of the angle 4 angle.

The viscosity gauge sensor works in a very cool way.

Triggered software time relay I

occurs at constant time intervals of T1 T, determined by the required duration of viscosity measurement of the co-controlled liquid. In the first position of this relay, the voltage from its first output is fed to the electric motor 2 and

electromagnetic clutch 3. When electromagnetic clutch 3 triggers, its input axis, mechanically connected to the shaft of the electric motor 2, is connected to the output axis connected to the flywheel 5, the sensing element 6 and the rotating parts of the angle marker 4. Rotating, the rotor of the electric motor 2 accelerates the related parts to the required angular velocity. This is accomplished during the acceleration of disperse. (Fig. 2a), after which the program relay

Time 1 goes into second position. In this case, the voltage at its first output disappears, and a single pulse is emitted from the second output. When the voltage is removed from the electromagnetic clutch 3 and the electric motor 2, the clutch disconnects

its input and output axles, and the motor shaft stops. A single pulse from the second output of software time relay 1 is fed to the first input of the counter 13 of time pulses and brings it to the zero state.

Then the software time relay switches to the third position, where constant voltage appears at its third output. It is applied to the electrical input of the angle gauge 4, as the voltage of the pit and, and to the second input

key 8 of the counting scheme, as permitting potential. If there is a supply voltage leveling, the rotation angle marker 4 emits pulses of short duration each time its rotor turns through a predetermined angle. This impulse,

firstly, it is fed directly to the first output of the viscosity gauge sensor, and, secondly, it nocTynaet to the first input of the group of output amplifiers 14, to the second group of inputs of which control slots are fed from the corresponding outputs of the counter 13 time pulses. Based on the incoming single pulse at the upper end of the group of output amplifiers 14, a parallel binary pulse code of the time of issuance of the next pulse of the angle indicator 4 is generated. This code goes to the second group of viscosity gauge sensor outputs. Thirdly, this pulse is fed to the input of the one-oscillator 9, whichG controls the counting of time pulses, it delays the counting of pulses of a quartz oscillator 7 by a counter 13 and 11 times the time it takes for the pulse of the rotation angle marker 4 to pass through a group of output amplifiers 14. This eliminates the possibility readout time or at the time of transient processes in the counter 13 pulses of time, which can lead to an error in the timing. The counting of the time pulses starts from the moment the permissive potential is supplied to the second input of the key 8 of the counting circuit after the program time relay switches to the third position. In this case, the pulses from the output of the crystal oscillator 7, arriving at the first input of the key 8 of the counting circuit, are passed through it and then simultaneously fed to the first inputs of the direct following keys 10 and following with a delay of 11. In the absence of a pulse at the output of the angle marker 4 The one-shot 9 is in a steady state 1Gai, in which from its outputs to the second inputs of the keys for direct following 10 and following with a delay of 11, the enabling and inhibiting potentials are respectively supplied. The pulse of the quartz oscillator 7 passes through the key 10 of the direct following and enters the second input of the counter 13 time pulses, increasing its contents by one. At the instants of the pulse at the output of the angle 4 of the rotation angle, the one-shot 9 turns into an unstable configuration. In this case, at the second inputs of the keys 10 and I, there are respectively forbidding and resolving potentials. The pulse of the quartz oscillator 7 passes through the following key with a delay of 11 and enters the delay line 12, in which it remains until the next pulse of the angle marker 4 leaves the sensor. After that, the one-shot 9 returns to the steady state, and the pulse from the output of the delay line 12 is fed to the second input of the counter 13 of time pulses and summed with it. At the end of the measurement time 1ism. software time relay 1 goes into fourth position. The voltage at its third outlet disappears. Since this removes the supply voltage from the angle of rotation 4, it ceases to give out voltage pulses. The pulses of the quartz oscillator 7 do not pass through the counting circuit 8, since the inhibitory potential is applied to its second input in this mode. In this state, the viscosity gauge sensor is before the start of a new measurement cycle. The principle of viscosity measurement using the proposed sensor is as follows. When the sensor element is rotated in a controlled fluid, it experiences a braking effect, depending on the viscosity of the fluid. Since during the measurement the motor is disconnected from the rotating parts of the measuring part of the sensor, the angular speed of their rotation, due to the energy consumption for overcoming the braking effect of the liquid, decreases. For some liquids, its velocity is characterized with sufficient accuracy by the following differential equation: -06-60. (1) where cj is the angular velocity of rotation; a is a reduction factor depending on the viscosity of the controlled fluid. and to be determined during the measurement process. The solution of this differential equation is (),. (2) where w o is the angular velocity of rotation at the beginning of the measurement. , Based on equation (2), you can determine the angle v5, which the sensitive element of the sensor rotates over a period of time ti-ti: Jo () dt ti r ° 2 g-06t () J (3) The angle indicator 4 turns on each time when the element of the sensor is rotated by the angle As / - Therefore, the time tj and tji of any two consecutive triggers is marked by the relation Acp.co, t ,, - t ,, i - () Jf4) The expression (4) at small values of fragile can be significantly simplified by typing each of its exponents in a series in which

Only the first three members can be counted. Then after conversion it can be brought to the form:

SObOb, PP

Df- ft. t

2 ()

In expression (5), the unknowns and wi oi are therefore to estimate the value of a and it is necessary, at a minimum, to measure the time of three successive triggers of the angle indicator 4. The measurement accuracy can be significantly improved by measuring the time of a larger number of marker operations and using a more complicated calculation algorithm magnitude a.

The obtained value of a allows further calculation of the viscosity of the liquid under study (t) based on the calibration curve). The nature of the calibration curve depends primarily on the selected design of the sensitive element of the sensor and must be determined experimentally.

The proposed viscosity gauge sensor significantly improves the measurement accuracy of the parameter under consideration and ensures, in particular, the required accuracy of control of the viscosity of the dressing in the glue box of the sander. This is achieved due to the fact that the sensor does not require the stabilization of the power supply of the electric motor and its parameters, as well as due to the high accuracy of the measurement of the response time of the angle of rotation indicator measured by Microseconds.

Due to the accuracy of viscosity measurement, it can be included in the sizing system and thus automates the management of important sizing parameters, such as sizing viscosity in the glue trough of the machine, the concentration of sizing, the true size of the main yarn. The automatic maintenance of the regulated mode of dressing makes it possible to drastically reduce the breakage of the main threads in weaving and, consequently, to increase the productivity of labor and equipment of the technological process. At the same time, the quality of the produced antiseptic tissue is significantly improved.

Claims (3)

1. Factory Laboratory, 1965, No. 2. 2. USSR author's certificate number 500472, cl. COIN 11/00, .1975. 3. Journal of the All-Union Chemical Society. 1961, Vol. N 4, S.417. R one " tpase “M. "Wp tj / 3K nv-gene b. vtm / a fex